Tonal printer utilizing heat prediction and temperature detectio

Details Tonal printer utilizing heat prediction and temperature detectio Tonal printer utilizing heat prediction and temperature detectio

1990-02-12

1991-11-19

Fuller, Benjamin R.

Recorders

Thermal recording

G01D 1510

Patent

active

050669613

ABSTRACT:
A tonal printer is provided which controls recording density through determination of line-wise compensation factors. These factors are used to correct the variation of recording density attributable to the temperature of the head mount and the cumulative heat of the heating element substrate. The printer uses a predicted value of temperature rise caused by the cumulative heat in a portion of the heating element substrate, which is predicted on the basis of the accumulated amount of applied energy to the thermal head and a measured value of the temperature in a portion of the head mount. The printer accurately produces density at all levels independently of the differences in the density distribution of images and the environmental temperature. A method is provided of creating correction data at a reference temperature and reference cumulative heat.

REFERENCES:
patent: 4547784 (1985-10-01), Erlichman et al.
patent: 4563691 (1986-01-01), Noguchi et al.
patent: 4688051 (1987-08-01), Kawakami et al.
patent: 4827281 (1989-05-01), Lubinsky et al.
patent: 4876559 (1989-10-01), Nishikawa

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